Other way

"How do I get in there?" said Celine. She was worried that the guards of Eijiro's mansion knew that Cellina was about to enter Eijiro's mansion. Cellina might be dragged away and reported for a criminal case.

 A bit of an exaggeration, but since Cellina was indeed an unauthorized person going in there could be something like that.

 Erland gripped the steering wheel hard, he groaned softly and patted his forehead. Apparently his wife was stupid, but only hidden behind her sly nature.

 "It's not like that, my wife. You don't have to go in there, we're both here just to watch if Eijiro's lover has left the mansion," Erland explained.

 Cellin breathed a sigh of relief, she could finally feel calmer. At first he thought that he would break into the mansion or sneak around like a thief. Luckily her husband was planning to just keep an eye on her, not tell her to go in there.

 "You remember what you have to do later, right?" said Erland.